Fine-tuning autofocus on D3s + 85 1.4D

Started Jan 17, 2012 | Discussions thread
Jarekn
Regular MemberPosts: 456
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Re: Fine-tuning autofocus on D3s + 85 1.4D
In reply to vladi1234567, Aug 5, 2012

You are not the only one... What was the distance to the object? Have you tried different distance to see how it changes the settings?

I tested number of different lenses using FoCal Pro:

50 mm 1.4, brand new 85 1.4, 24-70 2.8 and 70-200 2.8.

Number of test completely failed, here are some quick results:

50mm:
@ 1.4 @ 1.6m (reported distance to subject) = +18
@ 1.4 @ 1.0m = +12

@ 2.0 @ 1.0m = +15
@ 2.0 @ 1.6m = was unable to get results - tried few times.

24-70mm:
@ 2.8 @ 1.6m @ 50mm = -2
@ 2.8 @ 1.6m @ 24mm = +13
@ 2.8 @ 1.6m @ 70mm = unable to get results.

@ 2.8 @ 1m @ 50mm = +2
@ 2.8 @ 1.2m @ 24mm = +20
@ 2.8 @ 1m @ 70mm = unable to get results.

85 1.4:
@ 1.4 @ 1m = Unable to get any results
@ 1.4 @ 1.5m = +19
@ 1.4 @ 2m = unable to get results

70-200 2.8:
@ 2.8 @ 2.7m @ 200mm = +20
@ 2.8 @ 2.3m @ 105mm = +13
@ 2.8 @ 2.1m @ 70mm = +3

@ 4.5 @ 2.7m @ 200mm = unable to get results

Weird thing i noticed is that when i zoomed in/out on the 70-200 even though i didn't move the tripod, the distance to object was reported differently.

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